TB 9-6625-2102-24
Table 16. Distortion Accuracy
Audio analyzer indications
(<%)
0.5
(5) Set FREQ/MULT (Hz) switch to 100K.
(6) Measure distortion at 100 kHz. Audio analyzer will indicate within limit shown
in table 17.
Table 17. Distortion Accuracy
Audio analyzer indications
(<%)
1
(7) Adjust TI AMPLITUDE control fully ccw and disconnect audio analyzer.
b. Adjustments. Adjust R87 and R90 (fig. 2) for minimum distortion, less than 0.5%
as indicated on audio analyzer (R).
15. Main Generator Frequency
a. Performance Check
(1) Connect TI FUNCTION OUT (50 :) to frequency counter input A.
(2) Set up frequency counter to measure frequency (50 :).
(3) Set main generator FUNCTION switch to
and FREQ MULT (Hz)
VERNIER control fully cw to CAL.
(4) Set TI FREQ/MULT(Hz) to switch settings and frequency dial position for each
row in table 18. If measured frequency using frequency counter does not indicate within
limits, perform b (1) below.
Table 18. Main Generator Frequency
Test instrument
Frequency counter indications (kHz)
Test instrument
FREQ MULT (Hz)
Frequency dial
Adjustments
switch settings
positions
Min
Max
R10, R81 (R)
10
K
2.0
19.6
20.4
10
K
1.0
9.7
10.3
1
K
1.0
0.97
1.03
R562 (R)
1
K
2.0
1.96
2.04
100
2.0
0.196
0.204
100
1.0
0.097
0.103
10
M
1.2
11360.
12640.
10
M
2.0
19200.
20800.
C68 (R)
1
M
2.0
1960.
2040.
C125 (R)
100
K
2.0
196.
204.
C62 (R)
Set frequency dial to .02 and adjust R8 (fig. 2) for 200 Hz on frequency counter.
1
Connect multimeter between TP1 and TP2 ground (fig. 2). Adjust R56 (fig. 2) for 0 1 mV dc on multimeter (R).
2
(5) Set up frequency counter to measure period (50 :).